A promo commercial produced by Cartoon Network about an imaginery event called "Swimcon." I think the concept is to entice cosplayers to watch Cartoon Network together during Adult Swim--to have a house party for the occassion.
What a concidence cause there is a real "SwimCon" but with a different name called Anime Vegas Convention. The Anime Vegas organization recently celebrated its 3rd year last week and is about to produce the 2nd annual convention this Halloween in October. The Convention is organized by anime fans for anime fans - during the rest of the year the anime fans meet up for monthly screenings at the local library in cosplay...just like the Rocky Horror generation.
Bluenullity blog has the promo linked to its site.